Henry and Elizabeth Charles DAUBENSPECK

I am the great great granddaughter of John Doverspike/Dovenspike Sr. He married Anna Pence dau of Henry Pence and Elizabeth Gumbert. While I have always felt that John Sr. was the son of Henry and Elizabeth Charles Daubenspeck, I have now been presented with some info by another researcher who questions this line. I do know that one of John Sr's siblings was named John George and the question is why there would be two Johns? Obviously, they both grew to adulthood. John Sr and Anna Pence Doverspike left PA and made their way to IL and then on West to Iowa. I am currently searching for Henry or Elizabeth's will. I would be very grateful for any help in this department. Any info of any kind would be very much appreciated. Thanks so much! Nancy Lucas